tests/browser.worker: parse query string w/ URLSearchParams (#8781)

Author: alxndrsn

tests/integration/browser.worker.js

@@ -17,12 +17,12 @@ describe.skip('browser.worker.js', function () {
   before(function () {
     worker = new Worker('worker.js');
 
-    var sourceFile = window && window.location.search.match(/[?&]sourceFile=([^&]+)/);
+    let sourceFile = window && new URLSearchParams(window.location.search).get('sourceFile');
 
     if (!sourceFile) {
       sourceFile = '../../packages/node_modules/pouchdb/dist/pouchdb.js';
     } else {
-      sourceFile = '../../packages/node_modules/pouchdb/dist/' + sourceFile[1];
+      sourceFile = '../../packages/node_modules/pouchdb/dist/' + sourceFile;
     }
 
     worker.postMessage(['source', sourceFile]);